A physical model for the continuum variability and quasi-periodic oscillation in accreting black holes

摘要: The power spectra of black hole binaries have been well studied for decades, giving a very detailed phenomenological picture the variability properties and their correlation with energy spectrum (spectral state) source. Here we take truncated disc/hot inner flow which can describe spectral changes, show that propagating mass accretion rate fluctuations in hot match broad band spec tral seen binaries, i.e. give approximately limited noise b etween low high frequency break. break marks viscous timescale at outer edge flow, is disc. fr equency more complex than simply as propagation time delay means fast do not remain coherent . model also predicts Lense-Thirring precession this s et by combination radius together its surface density wh ich self consistently calculated from fluctuations. We natural ly gives observed relation between QPO moves inwards, many such coherence frequency, recently discovered flux on short timescales. fit total to sequence 5 obs erved bright binary XTE J1550-564 source transitioned low/hard state. This first om has physical variability. data are wel l if remains constant, while sweeps inwards � 60 12Rg. range radii same required models evolution, consistent description evolution both spe ctrum BHB.